What are the best conditions for observing?
Good or poor viewing is not always determined by the optics of a telescope. There can be external factors determining the quality of an image. The blanket of air surrounding the earth is constantly in motion. This shifting and swirling of the atmosphere causes a poor image especially at higher powers. This constantly changes so some nights may be better for viewing than others. Optical distortions made by the rippling of air currents emitting above a heated surface or area can cause a poor image. Objects are more distinct when viewing straight up because you are only viewing through an atmosphere of about 10 miles thick. This is opposed to an atmosphere 15 miles thick at 45 degrees, and over 100 miles thick near the horizon. Light pollution: If possible avoid using your scope around lights (street lights. house lights. etc.). A high magnifying telescope is very sensitive to light, resulting in a washed out image or an annoying glare. The effects of bright light become more obvious near
